Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X250
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X250 is a genuine double-acting ISO 15552 profile cylinder with a Ø50mm bore, 250mm stroke and a built-in spring-applied, air-released mechanical lock in the front cover — it holds the load at the extended (rod-out) stroke end even when air is lost.
- BoreØ50 mm
- Stroke250 mm
- Port sizeG1/4
- Lock positionFront cover
- Rod threadM16×1.5
- UnlockAir + manual
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X250
The AirTAC SAILF50X250 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. Because the lock engages at the extended stroke end, it secures the rod-out position and safely holds the load without requiring continuous live air pressure. In this 50mm bore class, the cylinder generates 982N of push thrust and 825N of pull thrust at 0.5 MPa.
A key design trait is that the variable air cushion at the locker end is shorter (20mm) compared to the free end (30mm), strictly serving to decelerate the piston before the static lock engages. The standard carbon steel piston rod is threaded M16x1.5, and the body utilizes a 1/4 PT port. For position sensing, a magnet is required to use AirTAC CMSE reed or DMSE electronic sensors, though this base unit ships without one.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X250 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X250 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø50 mm |
| Stroke | 250 mm |
| Acting type | Double acting, with lock |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| Lock type | Spring-applied, air-released (front cover) |
|---|---|
| Unlock | Automatic (air) & manual |
| Operating pressure | 0.15 – 1.0 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable (30 mm free end / 20 mm lock end) |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAIL datasheet (ISO 15552). Confirm against the product label before installation. Port options: PT / G.
How the Lock Holds
The lock is spring-applied and air-released: a spring drives a lock pin into the rod when the release air is removed, so the load is held at the extended (rod-out) stroke end without live pressure. Supply air to the release port to unlock automatically, or use the manual release lever.
The lock engages only when the piston reaches the stroke terminal on the front-cover side — it is a static end-of-stroke hold, not a mid-stroke clamp and not a moving-rod brake. For locking at any position along the stroke, choose a BSAI clamp-lock instead.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
Cylinder thrust is separate from the lock's holding capability. Actual usable force is lower than theoretical due to friction and back-pressure — size with a margin.
Where the Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X250 Is Used
Extended Lift Holding
Maintains a vertical load securely at the top extended position during a power loss, preventing sudden drops without consuming compressed air.
Clamp and Secure
Drives a part forward to the extended stroke end and mechanically locks it in place, ensuring the workpiece remains clamped if air pressure drops.
Gate Safety Stop
Holds a safety gate or guard firmly open at the front stroke terminal, requiring an intentional air release signal to unlock and close.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X250 the Right Lock Cylinder?
Choose this 50mm bore actuator when an application demands secure load holding at the rod-out position; if your process requires holding the load retracted, select the SAILB variant instead. If your design requires clamping at an arbitrary mid-stroke point rather than a stroke end, the BSAI clamp-lock cylinder is the correct choice. To scale force, stepping up to the 63mm bore yields 1559N at 0.5 MPa, while dropping to a 40mm bore provides 628N.
The lock is a static holding device that engages after the cylinder stops, not a dynamic brake for a moving rod. Pneumatic routing is critical: never use a fast-exhaust valve with this actuator, and always utilize an independent-exhaust solenoid valve, as back-pressure on the locker side can unintentionally release the lock. If human safety depends on the load remaining extended, add an independent mechanical safety measure. Replacement matches require 50mm bore, 250mm stroke, front locker, 1/4 PT port, and your chosen mounting style (Basic, FA, FB, CA, CB, CR, LB, TC, FTC, TCM1, or TCM2). Because this stroke is 250mm, ensure adequate external guide support to prevent excessive side-loading on the rod.
Quick checklist
- ✓ Hold needed at the extended (rod-out) end?
- ✓ Or lock anywhere → use BSAI
- ✓ Independent-exhaust valve fitted
- ✓ Port/thread type (PT/G)
- ✓ Extra safety measure for people
Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X250 FAQ
At 0.5 MPa operating pressure, the 50mm bore provides 982N of push force and 825N of pull force. At 0.7 MPa, the push force increases to 1374N.
The lock is spring-applied and air-released, engaging only when the piston reaches the extended stroke end to provide a static hold. It unlocks automatically via air supply to the release port or manually via a lever, but it cannot clamp at a mid-stroke position.
Related AirTAC Lock & Standard Cylinders
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